Double ramp for closing a receptacle holder

ABSTRACT

A receptacle holding unit includes a first part and a second part cooperating with the first part; a cavity for receiving a receptacle containing an ingredient for preparing a beverage by a device, the cavity being delimited by at least one of the first and second parts; and a driving device for relatively moving the second part towards the first part into a closed position and relatively apart from the first part into an open position. The driving device includes an actuator and a transmission having a helicoidal ramp arrangement cooperating with a connector member for converting a translational movement into a rotational movement or vice versa. When the actuator actuates the transmission, the first and second parts are driven together or apart. The ramp arrangement includes two ramps spaced apart and generally parallel between which the connector member relatively moves along the ramp arrangement.

CROSS REFERENCE TO RELATED APPLICATIONS

The present application is a National Stage of International ApplicationNo. PCT/EP2013/077276, filed on Dec. 19, 2013, which claims priority toEuropean Patent Application No. 12198336.5, filed on Dec. 20, 2012, theentire contents of which are being incorporated herein by reference.

FIELD OF THE INVENTION

The field of the invention pertains to beverage preparation devicesusing receptacles, such as capsules, of an ingredient of the beverage tobe prepared, in particular to devices arranged to prepare the beverageby circulation of a liquid into the ingredient receptacle andcentrifugation thereof, typically to brew the beverage in the ingredientreceptacle and extract the beverage therefrom.

For the purpose of the present description, a “beverage” is meant toinclude any human-consumable liquid substance, such as tea, coffee, hotor cold chocolate, milk, soup, baby food, etc . . . A “receptacle” ismeant to include any container such as a packaging for containing apre-portioned beverage ingredient, e.g. a flavouring ingredient, thepackaging forming an enclosure, e.g. a capsule, of any material, inparticular an airtight or pervious material, porous or non-porousmaterial, e.g. plastic, aluminium, recyclable and/or biodegradablepackagings, and of any shape and structure, including soft pods or rigidcartridges for containing the ingredient.

BACKGROUND ART

Certain beverage preparation machines use capsules containingingredients to be extracted or to be dissolved and/or ingredients thatare stored and dosed automatically in the machine or else are added atthe time of preparation of the drink. Some beverage machines possessfilling means that include a pump for liquid, usually water, which pumpsthe liquid from a source of water that is cold or indeed heated throughheating means, e.g. a thermoblock or the like.

Especially in the field of coffee preparation, machines have been widelydeveloped in which a capsule containing beverage ingredients is insertedin a brewing device. The brewing device is tightly closed about thecapsule, water is injected at the first face of the capsule, thebeverage is produced in the closed volume of the capsule and a brewedbeverage can be drained from a second face of the capsule and collectedinto a receptacle such as a cup or glass.

Brewing devices have been developed to facilitate insertion of a “fresh”capsule and removal of the capsule upon use. Typically, such brewingdevices comprise two parts relatively movable from a configuration forinserting/removing a capsule to a configuration for brewing theingredient in the capsule. The actuation of the movable part of thebrewing device may be motorized. Such a system is for example disclosedin EP 1 767 129. In this case, the user does not have to provide anymanual effort to open or close the brewing device. The brewing devicehas a capsule insertion passage provided with a safety door assembled tothe movable part of the brewing device via a switch for detecting anundesired presence of a finger in the passage during closure and preventinjuries by squeezing. The actuation of the movable part of the brewingdevice may be manual. WO 2009/043630 discloses a beverage preparationmachine including a brewing unit having a front part with a passage forinserting a capsule into the brewing unit. The front part is arranged totelescope out of the machine's housing for uncovering the passage forinserting a capsule into the brewing unit and telescopes into thebrewing unit for sliding the passage under the housing and thus coveringthe passage by the housing. A pivotable arched handle is configured fordriving the front part manually. WO 2005/004683 and WO 2007/135136disclose a device comprising a frame, a fixed holding part for thecapsule, a movable holding part which is mounted relative to the framein a sliding relationship, one or two knuckle joint mechanisms thatprovide a mechanical system for closing in a steady and fluid-tightmanner the holding parts about the capsule while also resisting to thecounter-force acting while re-opening and generated by the internalbrewing pressure, and a handle for directly levering the knuckle jointmechanism.

The preparation of a beverage by using centrifugation is also known.Such beverage preparation includes: providing a beverage (flavoring)ingredient, e.g. as powder and/or leaves, in a receptacle, e.g. in acapsule; circulating liquid into the receptacle and rotating thereceptacle at sufficient speed to ensure interaction of the liquid withthe ingredient while creating a gradient of pressure of liquid in thereceptacle. Such pressure increases gradually from the centre towardsthe periphery of the receptacle. As liquid traverses the ingredient,e.g. coffee bed, extraction of the ingredient, e.g. coffee compounds,takes place and a liquid extract is obtained that flows out at theperiphery of the receptacle. WO2008/148601 describes a possible exampleof a device using such centrifugal principle. In this case, theingredient receptacle is a sealed capsule which is opened before itsuse. Hot water is fed in the centre of the capsule via a waterinterfacing part comprising a water injector aligned in the rotationaxis. The receptacle is held in a capsule holder which is rotated bymeans of a rotary motor. Both the liquid interfacing part and thecapsule holding part are mounted along roller bearings. The beverage isextracted from the capsule by a plurality of peripheral needles thatcreates openings through a lid of the receptacle. As the capsule iscentrifuged about its rotation axis, hot water passes through thebeverage ingredient, interacts with it to produce a liquid extract andthe resulting liquid extract traverses, under the effect of thecentrifugal forces, the peripheral openings and is projected against animpact wall of the collector. The liquid extract, thus constituting thebeverage, is then drained through a beverage duct of the device andcollected into a recipient such as a cup. WO2008/148650 furtherdescribes a device wherein a flow restriction is created downstream ofthe receptacle, in particular a capsule, for example, by a valve systemwhich opens or enlarges under the pressure created by the centrifugedliquid leaving the receptacle. The valve system can be formed by amobile restriction part of the device which is elastically urged againsta rim portion of the capsule. U.S. Pat. No. 5,566,605 relates to acentrifugal type extraction cell having a deformable sealing joint forhot beverage preparation machine. The cell comprises a drum and a coverdefining with the drum an internal volume. The cover is connected to thedrum by attachment ears that engage in ramps. In these prior artdevices, the water interfacing part which supplies the receptacle withwater and the holding part which holds the receptacle are rotatablealong frame portions of the device which are secured together by aclosure mechanism such as a bayonet system or the like. The holding partis generally mounted on a frame part via at least one roller bearing.The liquid interfacing part is also generally part of a frame part alsomounted along at least one roller bearing. When the device is rotated athigh speed during centrifugation, the liquid extract creates importantaxial and radial forces which tend to separate these rotating parts.

A problem of the prior art devices comes from the difficulty to providea closure of the device about the receptacle that properly resists toaxial and radial forces created by the centrifugal pressure of theliquid. Some systems have been proposed to provide a solution to suchproblems, notably as disclosed in co-pending applicationsPCT/EP12/063654, PCT/EP12/063659 and PCT/EP12/063660.

Irrespectively of the extraction process itself it has also beenproposed to facilitate the handling of receptacles by system forextracting them, in particular by motorizing the opening and/or closureof the extraction system for inserting and/or removing a receptacle.Examples of such systems are for example disclosed in EP 1 767 129, WO2012/025258, WO 2012/025259 and EP 12157379.4.

SUMMARY OF THE INVENTION

The invention relates to a receptacle holding unit and to a deviceincluding such a unit for preparing a beverage from at least oneingredient and dispensing such prepared beverage. For instance, thedevice is a coffee, tea, chocolate, cacao, milk or soup preparationmachine. In particular, the device is arranged for preparing within abeverage processing module that includes the receptacle holding unit, abeverage by passing hot or cold water or another liquid through areceptacle held in the unit, such as a held capsule, containing aningredient, such as a flavouring ingredient, of the beverage to beprepared, such as ground coffee or tea or chocolate or cacao or milkpowder.

Such beverage preparation typically includes the mixing of a pluralityof beverage ingredients, e.g. water and milk powder, and/or the infusionof a beverage ingredient, such as an infusion of ground coffee or teawith water. For instance, a predetermined amount of beverage is formedand dispensed on user-request, which corresponds to a serving. Thevolume of such a serving may be in the range of 25 to 250 ml, e.g. thevolume for filling a cup or mug, depending on the type of beverage.Formed and dispensed beverages may be selected from ristrettos,espressos, lungos, cappuccinos, café latte, americano coffees, teas, etc. . . For example, a coffee machine may be configured for dispensingespressos, e.g. an adjustable volume of 20 to 60 ml per serving, and/orfor dispensing lungos, e.g. a volume in the range of 70 to 200 ml perserving.

An aspect of the invention relates to a receptacle holding unit for adevice for preparing a beverage from an ingredient contained in areceptacle, in particular by circulating a liquid into such receptacleand centrifugally driving such receptacle.

The unit comprises: a first part and a second part cooperating with thefirst part; a cavity for receiving the receptacle, the cavity beingdelimited by at least one of the first and second parts; a drivingdevice for relatively moving the second part towards the first part, inparticular along a longitudinal axis, into a closed position forsecuring the receptacle in the cavity and relatively apart from thefirst part into an open position for inserting said receptacle into thecavity and/or for removing the receptacle therefrom. The driving devicecomprises an actuator and a transmission that has a helicoidal ramparrangement cooperating with a connector member for converting atranslational movement into a rotational movement or vice versa.

The actuator may be manually driven or electrically powered. Theactuator can be a motor.

The helicoidal ramp arrangement is mounted to the first part and theconnector member is mounted to the second part so that, when theactuator actuates the transmission, the first and second parts aredriven together or apart by the helicoidal ramp arrangement cooperatingwith the connector member.

Optionally, the driving device comprises a plurality of pairs formed ofa helicoidal ramp arrangement and a connector member. For example thedriving device comprises: two such pairs, e.g. two pairs having twohelicoidal ramp arrangements separated by an angle of 180° deg about theaxis of the helicoidal ramp arrangement, or three such pairs, e.g. threepairs with three helicoidal ramp arrangements relatively separated by anangle of 120° deg, or four such pairs, e.g. four pairs with fourhelicoidal ramp arrangements relatively separated by an angle of 90°deg.

Hence, such a receptacle holding unit may be static or dynamic duringbeverage preparation. For instance, the receptacle holding unit isarranged to rotate, in particular at elevated speed, e.g. above 1000 or2000 RPM, to enhance processing of the ingredient in the receptacle, inparticular mixing thereof with a liquid circulated into the receptacle.In the latter configuration, the first and second parts move togetherduring beverage preparation in a manner to be angularly fixed one toanother about the axis of relative rotation. The axis of relativerotation may be the same as or different to the axis of relativerotation of the first and second parts into and out of the connectionconfiguration. Hence, the holding unit may be connected to an actuatorfor rotatably driving the unit to prepare a beverage. The first andsecond parts of the unit can be rotatably driven altogether (e.g. enbloc) about an axis that is generally identical to the axis of thehelicoidal ramp arrangement. The first or the second part may beactuatable by a motor to drive the unit altogether about this axis. Theactuated part preferably drives the other part.

Depending on the type of receptacle to be used in the receptacle holdingunit, e.g. closed or partly closed receptacles, the unit may have apiercing device driven by the driving device for piercing such areceptacle. The piercing device may be driven along the direction ofrelative movement of the first and second parts. Hence, the driving ofthe piercing device can be integrated in the same movement of thedriving device as for driving the first and second parts.

For instance, the piercing device is assembled to and held by the secondpart. In such a configuration, the piercing device will be generallylinked to the second part and generally follow the relative movement ofthe second part.

The piercing device may have a member extending along the axis of thehelicoidal ramp arrangement and/or one or more members that are off-setrelative to this axis, in particular in a generally circular arrangementabout such an axis.

The piercing device may have a axial piercing element extending alongthis axis, such as a centrally located piercing element. The axialpiercing element comprises in particular a channel for guiding a liquidinto said receptacle and/or out thereof.

Liquid may be injected into the receptacle and/or drained out from thereceptacle through the opening(s) formed by the axial and/or off-axispiercing element(s). For example, the liquid may be circulated intoand/or from the receptacle via a channel located in the piercingelements and/or adjacent to the piercing element(s). One or morepiercing elements may also be withdrawn from the receptacle to allow thepassage of liquid via the opening(s) formed by the piercing element(s)in the receptacle.

In accordance with the invention, the ramp arrangement comprises twospaced apart and generally parallel first and second ramps inbetweenwhich the connector member relatively moves along the ramp arrangement.

Hence, the connector member is secured inbetween the ramp arrangementsby two facing ramps (on each side of the connector member) so thatforces can be transmitted from and to the connector member from eitherside (typically from above and from below) to the helicoidal ramparrangement. Hence, the transmission can work in both direction (againstopening or closure), whether the first and second parts are being openedor closed.

The connector member can be urged against the first ramp in the closedposition and against the second ramp in the open position. For instance,the connector member may be urged against the first ramp during closureto pull a movable cover part connected to the first or the second partfrom an open position into a closed position, such as a cover part thatis biased into an open position by a resilient device connected to acover support. The connector member may rest on the second ramp when thefirst and second parts are moved between the open and closed positions.

The helicoidal ramp arrangement can have a first portion with a smallerslope and a second portion with a greater slope for adjusting atransmission speed and force between the ramp arrangement and theconnector member to adjust a resulting speed and force of the first andsecond parts moving between their open and closed positions.

The speed and force of the first and second parts may thus be adjustedaccording to the required need by adjusting the slope of the ramparrangement cooperating with the connecting member. For instance, when areceptacle needs to be pierced, force is more important than speed. Whenthe first and second portions are moved from a first spacing to a secondspaced during which no particular force is required, speed may be moreimportant than force. At the end of the movement of the first and secondparts, the speed can be reduced to avoid a shock at the end of thetravel.

For instance, the first portion with a smaller slope is at a slope tothe plane orthogonal to the axis of the helicoidal ramp arrangement inthe range of 0 to 15%. The slope of the second portion to the orthogonalplane may be greater than the slope of the first portion, e.g. between50 and 150%. When the helicoidal ramp arrangement has a diameter in therange of 50 to 150 mm, e.g. 75 to 125 mm, the first portion may have apitch in the range of 0 to 15 mm, e.g. 0 to 8 mm, and the second portionmay have a pitch that is greater than the pitch of the first portion,such as 30 to 125 mm e.g. 50 to 75 mm. These values may of course beproportionally increased or decreased.

The ramp may have variable slope portions (spline). The slope (or pitch)of the helicoidal ramp arrangement may progressively increase (ordecrease) or change incrementally. For instance, an intermediate rampportion may be provided between the first and second portions. Such anintermediate ramp portion may have a progressive slope increasing from avalue in a first range of 0 to 15% to a second value in a second rangeof 50 to 150 mm, the first and second values corresponding typically tothe values of the slopes of the first and second ramps.

The same considerations apply mutatis mutandis to the optional (smallerslope) third portion mentioned below and its relation to the (greaterslope) second portion.

The first portion can form an end portion of the ramp arrangement whichcontacts the connector member in the open or closed position. The ramparrangement may include a third portion having a slope that is smallerthan the greater slope of the second portion, in particular a slope thatis equal to the smaller slope of the first portion. The third portioncan form an end portion of the ramp arrangement that is opposite to thefirst portion.

The second portion can extend from the first portion and form at least amiddle portion of the ramp arrangement.

The driving device typically has a controller for controlling theactuator, the controller being preferably configured to detect when theconnector member reaches an end position on the helicoidal ramparrangement and stop the actuator, in particular at an end positionalong the ramp arrangement corresponding to the open or the closedposition. Optionally, the ramp arrangement is associated with one ormore end position switches that are connected to the controller fordetecting the presence of the connector member at the end position(s) orthe controller is arranged to monitor a parameter, such as the currentor the voltage, of a power consumption of the actuator to determine thepresence of the connector member at the end position(s). It is alsopossible to arrange an indirect detection of the relative position ofthe ramp arrangement and the connector member, for instance by detectinga relative position of the first and second parts or by measuring aduration of the closure or opening movement thereof.

The first and the second parts can be secured in the open or the closedposition by maintaining the actuator of the driving device activated.

The transmission can be a one-way transmission that prevents the firstand second parts from moving between the open and the closed positionswithout correspondingly powering the actuator of the driving device.

Hence, it is possible but not required, to use a fastening device, suchas a latch or a lock or equivalent means, to secure the first and secondparts in a closed position during beverage preparation, e.g. to resist apressure rise urging the first and second parts apart.

The first and second parts may be relatively moved along a path from theopen to the closed position, the first part and the helicoidal ramparrangement being movable as a unit along path and/or the second partand the connector member being movable as a unit along the path.Optionally, the helicoidal ramp arrangement is rotatably mounted aboutthe path to the first part. Movable as a “unit” means that the elementsof one unit (e.g. the helicoidal ramp arrangement and the first part asone unit, and/or the connector member and the second part as one unit)follow each other at a generally constant distance when moved alongpath, the elements being allowed to move relative to each other in adirection different to the direction of the path, for example they canrelatively pivot about the path.

The first and second parts can be relatively moved along a path from theopen to the closed position and vice versa, the helicoidal ramparrangement being rotatable about the path and the connector memberbeing translatable along the path or vice versa.

The second part typically has a frame to which the connector member ismounted, the connector member forming in particular a toothed or plainwheel cooperating with the ramp arrangement that is optionallycorrespondingly toothed or plain. The connector member may also form aplain pin or rod that follows the shape of the ramp arrangement.

The first part can have a first receptacle engagement device that isrotatable about an axis which is generally parallel to an axis of thehelicoidal ramp arrangement.

The second part may have a second receptacle engagement device that isrotatably mounted to the connector member, in particular via a frameand/or a ball bearing. Optionally, the second receptacle engagementdevice comprises or defines a fluid outlet for circulating a fluid to areceptacle contained in the cavity and/or comprises or defines a fluidoutlet for guiding an extract from a receptacle contained in the cavity.

The fluid outlet may be connected to a fluid line that is joined to theoutlet via a rotatable seal.

For instance, the second receptacle engagement device is provided withone or more peripheral piercing members to form one or morecorresponding openings at a periphery of a receptacle. By mounting theengagement device on a pivotable bearing, the engagement device canfollow a rotation of the receptacle during piercing so that thereceptacle is not laterally torn by a relative rotation of suchperipheral piercing member(s) penetrating into or located in thereceptacle.

For example, the first part has a first receptacle engagement device andthe second part has a second receptacle engagement device that aresecured together in the closed position and rotatably mounted relativeto the helicoidal ramp arrangement and to the connector member. Thefirst and second engagement devices may be driven in rotation by anactuator connected to at least one of the first and second engagementdevices, in particular by a motor such as a motor secured to a base by asupport. Optionally, the support fixes one of the first and secondreceptacle engagement devices via a rotational bearing.

The ramp arrangement may be rotatably mounted on a base on which thefirst part is mounted. The second part can be movable towards and awayfrom the base.

Another aspect of the invention relates to a beverage preparation devicethat comprises a receptacle holding unit as described above.

A further aspect of the invention relates to a combination of areceptacle containing a beverage ingredient and: a receptacle holdingunit as described above; or a beverage preparation device as describedabove.

Yet another aspect of the invention relates to a use of a receptaclecontaining a beverage ingredient for a receptacle holding unit asdescribed above or for a beverage preparation device as described aboveor for providing a combination of a receptacle and a unit as describedabove.

The receptacle may be in the form of a capsule that has a flange, e.g. arim, that can be secured inbetween the first and second parts. Thecapsule may have a body that is symmetric or asymmetric, conical orfrusto-conical or cylindrical or spherical or hemispherical orfrusto-spherical, containing the ingredient, e.g. ground coffee, tea orcacao or another beverage ingredient.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will now be described with reference to the schematicdrawings, wherein:

FIG. 1 illustrates part of a driving device of a receptacle holding unitin accordance with the invention;

FIG. 2 illustrates a variation of the embodiment illustrated in FIG. 1;

FIGS. 3a to 3c show perspective and partly cut-away views of areceptacle holding unit fitted with the driving device of FIG. 2; and

FIGS. 4a to 4c show cross-sectional views of the embodiment shown inFIGS. 3a to 3 c.

DETAILED DESCRIPTION

FIGS. 1 to 4 c illustrate an exemplary embodiment of a receptacleholding unit 1 and parts thereof in accordance with the invention.

Receptacle holding unit 1 can be incorporated into an ingredientprocessing module of a beverage preparation device, typically of thecentrifugal type, e.g. as disclosed in EP 2 000 062, EP 2 155 020, EP 2152 128, WO 2008/148646, WO 2009/106175, WO 2009/106589, WO 2010/026045,WO 2010/026053 and WO 2010/066736. Unit 1 has a seat 11′ for receivingand housing an ingredient receptacle, e.g. of the type disclosed in thesame references or in WO 2008/148650, WO 2008/148834, WO 2010/066705, WO2010/063644 and WO 2011/023711. The receptacle may be of the typedescribed above under the header “field of the invention”. Thereceptacle may be a capsule that has a container-body, e.g. a generallycup-shaped or hemispherical or hemi-ellipsoidal body, having a rim or aflange to which a cover lid is attached, in particular sealed. Typicallythe receptacle contains a beverage ingredient. The invention can also beused in other fields than beverage preparation.

A beverage may be prepared by circulating a liquid into a receptaclecontaining a beverage ingredient which receptacle is housed in holdingunit 1 and centrifugally driving such receptacle by the holding unit.

Unit 1 is usually configured to circulate a liquid into the receptacle,typically for mixing with the ingredient, e.g. brewing the ingredient,contained in the receptacle. A flavoured beverage may be prepared bycirculating a carrier liquid, such as water, into the receptacle formixing the carrier with the ingredient and form the beverage, e.g. bybrewing. An automatic receptacle recognition system may be used toparameterize and adjust the processing of the ingredient automaticallyin line with the type of ingredient.

When closed or partly-closed receptacles of flavouring ingredients, e.g.ingredient capsules, are used, unit 1 may include a receptacle opener211 such as blades and/or a tearing tool that may be centrally arranged(e.g. on axis 1′) and/or peripherally arranged (e.g. about axis 1′).Alternatively, receptacle may be a partly or fully self-opening capsule,e.g. under the effect of centrifugation and/or pressure of liquidcirculated into the receptacle. The receptacle may be of the open-type,in which case no opener is needed.

Typically, a beverage preparation device comprising unit 1 of theinvention further includes one or more of the following components:

a) a fluid system in which unit 1 is in fluid communication;

b) an in-line heater for heating a flow of liquid circulated throughunit 1 or a batch heater for circulating heated liquid from the batchheater to unit 1;

c) a pump for pumping liquid to unit 1, in particular a low pressurepump e.g. within the range of 1 to 5 bar, such as 1.5 to 3 bar;

d) a motor for driving unit 1 in rotation during beverage preparation;

e) an electric control unit, in particular comprising a printed circuitboard (PCB), for receiving instructions from a user via an inputuser-interface and for controlling the heater, pump and motor(s); and/or

f) one or more sensors for sensing at least one characteristic selectedfrom characteristics of fluid system including unit 1, the heater, thepump, a liquid tank, an ingredient collector, a flow of the liquid (e.g.by a flowmeter), a pressure of the liquid and a temperature of theliquid, and for communicating such characteristic(s) to the controlunit.

Moreover, receptacle holding unit 1 is typically associated with abeverage collection and dispensing system, e.g. as disclosed in WO2009/106175 and WO 2010/089329.

Receptacle holding unit 1 comprises: a first part 10 and a second part20 cooperating with first part 10 as well as a cavity 11′ for receivingsuch receptacle, the cavity being delimited by at least one of first andsecond parts 10,20. Typically cavity 11′ has a shape that generallymatches the receptacle or that can at least surround the receptacle. Forinstance, cavity 11′ is delimited by recessed wall(s) of first part 10and covered by second part 20 that forms a lid on the recessed wall(s).

Furthermore, holding unit 1 has a driving device 30 for relativelymoving second part 20:

towards first part 10, in particular along a longitudinal axis 1′, intoa closed position for securing the receptacle in the cavity 11′; and

relatively apart from first part 10, in particular along a longitudinalaxis 1′, into an open position for inserting the receptacle into thecavity 11′ and/or for removing the receptacle therefrom.

Driving device 30 comprises an actuator 31 and a transmission 22,32 thathas a helicoidal ramp arrangement 32 cooperating with a connector member22 for converting a translational movement into a rotational movement orvice versa. Helicoidal ramp arrangement 32 is mounted to first part 10and connector member 22 is mounted to second part 20 so that, whenactuator 31 actuates transmission 22,32, first and second parts 10,20are driven together or apart by helicoidal ramp arrangement 32cooperating with connector member 22. Optionally, the driving device 30comprises a plurality of pairs 22,32; 22,32′ formed of a helicoidal ramparrangement 32,32′ and a connector member 22,22′. For instance, drivingdevice 30 has two such pairs 22,32; 22,32′ or three or four such pairs.

Ramp arrangement 32,32′ may be mounted on integral with a cylindricalframe 320 that can be rotatably mounted on a base 40.

In the exemplified embodiment, ramp arrangement 32,32′ is driven inrotation by actuator 31, e.g. an electric motor. For instance, actuator31 drives ramp arrangement via a worm drive 310,311 formed of a helicalgear 310 fixed to actuator 31 and a spur gear 311 fixed to helicoidalarrangement 32,32′ (FIG. 1) or via a worm drive 310,312 a driving aconnection rod 312 fixed to a pinion 312 b that engages with a wheel 311fixed to helicoidal arrangement 32,32′ (FIG. 2). Actuator 31 istypically fixed to a base 40, ramp arrangement 32,32′ being rotatablymounted on base 40.

Connector member 22,22′ can be driven by rotatable ramp arrangement32,32′ that rotates and thus pushes or pulls member 22,22′. Inparticular, connector member 22,22′ may be arranged to move along axialdirection 1′ of ramp arrangement 32,32′. For instance connector member22′ is mounted on a frame 23 of second part 20, frame 23 being preventedfrom rotating about direction 1′. For example, frame 23 is arranged totranslate along axis 1′ and/or pivot away or towards axis 1′.

In FIGS. 3a to 3c , a bottom end of frame 23 (right-hand foot of frame23) has been cut-away for the purpose of illustrating the presence ofconnector member 22.

Helicoidal ramp arrangement 32 has a first portion 321 with a smallerslope and a second portion 322 with a greater slope for adjusting thetransmission speed and force between ramp arrangement 32 and theconnector member 22 to adjust a resulting speed and force of the firstand second parts 10,20 moving between their open and closed positions.

The speed and force of first and second parts 10,20 may be adjustedaccording to the required need in particular by adjusting the slope oframp arrangement 32 cooperating with connecting member 22. For instance,when a receptacle needs to be pierced, force is more important thanspeed. When first and second portions are moved from a first spacing toa second spaced during which no particular force is required, speed maybe more important than force. At the end of the movement of first andsecond parts 10,20 the speed should be reduced to avoid a shock at theend of the travel.

First portion 321 of smaller slope may form an end portion of ramparrangement 32,32′ which contacts the connector member 22,22′ in theopen position (FIGS. 3a and 4a ). Such a slope reduction at the end oframp arrangement 32,32′ reduces the translational speed of connectormember 22,22′ relative to the angular speed of the ramp arrangement andincreases the force transmitted by connector member 22,23′ relative tothe torque of the rotating ramp arrangement.

Ramp arrangement 32 may comprise a second portion 322 having a slopethat is greater than the smaller slope of first portion 321. Such aslope increase of ramp arrangement 32,32′ increases the translationalspeed of connector member 22,22′ relative to the angular speed of theramp arrangement 32,32′ and reduces the force transmitted by connectormember 22,23′ relative to the torque of the rotating ramp arrangement.

Second portion 322 typically extends from first portion 321 and forms atleast a middle portion of ramp arrangement 32.

Ramp arrangement 32 may comprise a third portion 323 having a slope thatis smaller than the greater slope of second portion 322, in particular aslope that is equal to the smaller slope of first portion 321. Forinstance, third portion 323 forms an end portion of ramp arrangement 32that is opposite to first portion 321. Likewise, such a slope reductionat the end of ramp arrangement 32,32′ reduces the translational speed ofconnector member 22,22′ relative to the angular speed of the ramparrangement and increases the force transmitted by connector member22,23′ relative to the torque of the rotating ramp arrangement.

First, second and third portions 321,322,323 may have slopes and pitchesin the ranges described above in the Summary of the Invention.

First and second parts 10,20 can be permanently mechanically linkedtogether during the normal use of unit 1 (excluding servicing orrepairing operations involving a dismantling of unit 1).

In the exemplified embodiment, ramp arrangement 32 comprises two spacedapart and generally parallel first and second ramps 32 a,32 b inbetweenwhich connector member relatively moves along ramp arrangement 32.Hence, member 22 is secured between two ramps 32 a,32 b so as to avoidsignificant translation displacement of member 22 that would beindependent from a rotation of ramp arrangement 32. Furthermore,depending on the forces exercised, member 22 may be urged or rest eitheragainst ramp 32 a (e.g. when member 22 is pulled or retained upwards) oragainst ramp 32 b (e.g. when member 22 is puller or retained downwards.The spacing between the facing ramps 32 a,32 b or their facing surfacesmay be varied to facilitate or slow down the passage of connector member22. For instance, ramps 32 a,32 b may squeeze and block connector member22 when it reaches an end position inbetween ramps 32 a,32 b.

For instance, connector member 22 can be urged against first ramp 32 ain the closed position (FIGS. 3c and 4c ). As schematically illustratedin FIGS. 4a to 4c , connector member 22 may be urged against first ramp32 a during (at least part of) closure to pull a movable cover part 51connected to first or second part 10,20 from an open position into aclosed position such as a cover part that is biased into an openposition by a resilient device 52 connected to a cover support 53. Evenin such a case, connector member 22 may rest on second ramp 32 b in theopen position, e.g. if resilient device 52 is sufficiently relaxed inthis position. Cover 51 may be connected to first part 10 or second part20, e.g. by a resilient member or by a cam-follower and cam mechanism(not shown) so that cover 51 follows the relative movement of first andsecond parts 10,20. Cover support 53 may be fixed or assembled to base40.

Connector member 22 can rest on second ramp 32 b when first and secondparts 10,20 are moved between the open and closed positions. Optionallyconnector member 22 rests on second ramp 32 b in the open position.

Driving device 30 may have a controller for controlling actuator 31, thecontroller being configured to detect when connector member 22 reachesan end position 324,325 on helicoidal ramp arrangement 32 and stopactuator 31, in particular at an end position 324,325 along ramparrangement 32 corresponding to the open or the closed position.Optionally, ramp arrangement 32 is associated with one or more endposition switches 326 that are connected to the controller for detectingthe presence of connector member 32 at end position 325 or thecontroller is arranged to monitor a parameter, such as the current orthe voltage, of a power consumption of actuator 31 to determine thepresence of connector member 32 at end position 324, e.g. the ramparrangement 32 includes a wall for stopping connector member 22 at endposition 324.

First and second parts 10,20 can be secured in the open position (FIGS.3a and 4a ) or the closed position (FIGS. 3c and 4c ) by maintainingactuator 31 of driving device 30 activated.

Transmission 22,32 can be a one-way transmission that prevents first andsecond parts 10,20 from moving between the open and the closed positionswithout correspondingly powering actuator 31 of driving device 30. Insuch a case, it is not necessary to maintain a powering of the actuator31 in the closed position.

Hence, it is possible but not required, to use a fastening device, suchas a latch or a lock or equivalent means, to secure first and secondparts 10,20 in a closed position during beverage preparation, e.g. toresist a pressure rise urging first and second parts 10,20 apart.

First and second parts 10,20 can be relatively moved along path 1′ fromthe open position to the closed position, first part 10 and helicoidalramp arrangement 32 being movable as a unit along path 1′ and/or secondpart 20 and connector member 22 being movable as a unit along path 1′.Helicoidal ramp arrangement 32 can be rotatably mounted about path 1′ tothe first part 10. In this case, movable as a “unit” means that theelements follow each other at a generally constant distance when movedalong path 1′, the elements being allowed to move relative to each otherin a direction different to the direction of path 1′, for example theycan relatively pivot about path 1′.

First and second parts 10,20 can be relatively moved along path 1′ fromthe open to the closed position, the helicoidal ramp arrangement 32being rotatable about path 1′ and connector member 22 being translatablealong path 1′ or vice versa.

As mentioned above, second part can have a frame 23 to which connectormember 22 is mounted. For example, connector member 22 forms a toothedor plain wheel cooperating with ramp arrangement 32 that is optionallycorrespondingly toothed or plain. In an alternative embodiment,connector member 22 may be fixed to frame 23 and slide along ramparrangement 32.

First part 10 may have a first receptacle engagement device 11 that isrotatable about an axis 1′ which is generally parallel, in particularidentical, to axis 1′ of helicoidal ramp arrangement 32.

Second part 20 has a second receptacle engagement device 21 that isrotatably mounted to connector member 22, in particular via a frame 23and/or a ball bearing 231. Optionally, second receptacle engagementdevice 21 comprises or defines a fluid outlet 211 for circulating afluid to a receptacle contained in cavity 11′ and/or comprises ordefines a fluid outlet for guiding an extract from a receptaclecontained in cavity 11′. Fluid outlet 211 may be connected to a fluidline 211′ that is joined to outlet 211 via a rotatable seal 211″.

For instance, second receptacle engagement device 21 is provided withone or more peripheral piercing members (not shown) to form one or morecorresponding openings at a periphery of a receptacle. By mountingengagement device 21 on a pivotable bearing 231, engagement device 21can follow a rotation of the receptacle during piercing so that thereceptacle is not laterally torn by a relative rotation of suchperipheral piercing member(s) penetrating into or located in thereceptacle.

First part 10 may have a first receptacle engagement device 11 andsecond part 20 can have a second receptacle engagement device 21. Firstand second receptacle engagement devices 11,21 may be static or dynamicduring beverage preparation. For instance, engagement devices 11,21 arearranged to rotate, e.g. centrifuged, in particular at elevated speed,e.g. above 1000 or 2000 RPM, to enhance processing of the ingredient inthe receptacle, in particular mixing thereof with a liquid circulatedinto the receptacle. In the latter configuration, engagement devices11,21 move together into the closed position in a manner to be angularlyfixed one to another about axis 1′ of relative rotation. Axis 1′ ofrelative rotation of connector member 22 and ramp arrangement 32 may bethe same as or different to the axis of the ingredient processingrotation.

A first engagement device 11 and a second engagement device 21 may beprovided with an (angular) fastening arrangement, e.g. a firstperipheral profile 112 and a second peripheral profile 212 thatcooperate with first profile 112 to prevent relative rotation of firstand second engagement devices 11,21 when in the closed position. Such afastening may prove to be particularly useful if first and secondengagement devices 11,21 are rotated during the ingredient processing.

Hence, in an embodiment, first part 10 has a first receptacle engagementdevice 11 and second part 20 has a second receptacle engagement device21 that are secured together in the closed position and rotatablymounted relative to ramp arrangement 32 and to connector member 22. Inthis embodiment, first and second engagement devices 11,21 are driven inrotation by an actuator 12 connected and driving at least one of firstand second engagement devices 11,21 (the other engagement device beingdriven by the companion engagement device), in particular by a motor 12,such as a motor 12 secured to a base 40 by a support 13. Optionallysupport 13 fixes one of first and second receptacle engagement devices11,21 via a rotational bearing 14. For example, support 13 is fixed tobase 40 by one or more legs 131 (as illustrated in FIG. 4a ). Bearing 14may be fixed to support 13 by one or more arms 132 (as illustrated inFIG. 4a ).

Ramp arrangement 32 may be rotatably mounted on a base 40 on which firstpart 10 is mounted, the second part 20 being movable towards and awayfrom base 40 by the action of transmission 22,32.

As mentioned above, receptacle may be in the form of a capsule that hasa flange, e.g. a rim, that can be secured inbetween first and secondparts 10,20. The capsule may have a body that is, symmetric orasymmetric, conical or frusto-conical or cylindrical or spherical orhemispherical or frusto-spherical or domical or frusto-domical,containing the ingredient, e.g. ground coffee, tea or cacao or anotherbeverage ingredient.

The invention claimed is:
 1. A receptacle holding unit for a device forpreparing a beverage from an ingredient contained in a receptacle bycirculating a liquid into the receptacle and centrifugally driving thereceptacle, the receptacle holding unit comprising: a first part and asecond part cooperating with the first part; a cavity for receiving thereceptacle, the cavity being defined by at least one of the first partand the second part; and a driving device for relatively moving thesecond part towards the first part, into a closed position for securingthe receptacle in the cavity and relatively apart from the first partinto an open position for inserting the receptacle into the cavityand/or for removing the receptacle therefrom, the driving devicecomprising an actuator and a transmission that has a helicoidal ramparrangement cooperating with a connector member for converting atranslational movement into a rotational movement or vice versa, and thehelicoidal ramp arrangement being mounted to the first part and theconnector member being mounted to the second part so that, when theactuator actuates the transmission, the first part and the second partare driven together or apart by the helicoidal ramp arrangementcooperating with the connector member, the driving device comprising aplurality of pairs of the helicoidal ramp arrangement cooperating andthe connector member, and/or the first part and the second part beingsecured in the open position or the closed position by maintaining theactuator of the driving device activated, the helicoidal ramparrangement comprises a first ramp and a second ramp that are spacedapart and generally parallel and between which the connector memberrelatively moves along the helicoidal ramp arrangement, and theconnector member is urged against the first ramp in the closed positionand against the second ramp in the open position.
 2. The receptacleholding unit of claim 1, wherein the connector member rests on thesecond ramp when the first part and the second part are moved betweenthe open position and the closed position.
 3. The receptacle holdingunit of claim 1, wherein the transmission is a one-way transmission thatprevents the first part and the second part from moving between the openpositions and the closed position without correspondingly powering theactuator of the driving device.
 4. The receptacle holding unit of claim1, wherein the first part and the second part are relatively moved alonga path from the open position to the closed position, the first part andthe helicoidal ramp arrangement being movable as a unit along the pathand/or the second part and the connector member being movable as a unitalong the path.
 5. The receptacle holding unit of claim 1, wherein thefirst part and the second part are relatively moved along a path fromthe open position to the closed position and vice versa, the helicoidalramp arrangement being rotatable about the path and the connector memberbeing translatable along the path or vice versa.
 6. The receptacleholding unit of claim 1, wherein the second part has a frame to whichthe connector member is mounted.
 7. The receptacle holding unit of claim1, wherein the first part has a first receptacle engagement device thatis rotatable about an axis which is generally parallel to an axis of thehelicoidal ramp arrangement.
 8. The receptacle holding unit of claim 1,wherein the second part has a second receptacle engagement device thatis rotatably mounted to the connector member.
 9. The receptacle holdingunit of claim 1, wherein the first part has a first receptacleengagement device, the second part has a second receptacle engagementdevice, the first receptacle engagement device and the second receptacleengagement device are secured together in the closed position androtatably mounted relative to the helicoidal ramp arrangement and to theconnector member, the first receptacle engagement device and the secondreceptacle engagement device being driven in rotation by an actuatorconnected to at least one of the first receptacle engagement device andthe second receptacle engagement device.
 10. The receptacle holding unitof claim 1, wherein the helicoidal ramp arrangement is rotatably mountedon a base on which the first part is mounted, the second part beingmovable towards and away from the base.
 11. A receptacle holding unitfor a device for preparing a beverage from an ingredient contained in areceptacle by circulating a liquid into the receptacle and centrifugallydriving the receptacle, the receptacle holding unit comprising: a firstpart and a second part cooperating with the first part; a cavity forreceiving the receptacle, the cavity being defined by at least one ofthe first part and the second part; and a driving device for relativelymoving the second part towards the first part, into a closed positionfor securing the receptacle in the cavity and relatively apart from thefirst part into an open position for inserting the receptacle into thecavity and/or for removing the receptacle therefrom, the driving devicecomprising an actuator and a transmission that has a helicoidal ramparrangement cooperating with a connector member for converting atranslational movement into a rotational movement or vice versa, thehelicoidal ramp arrangement being mounted to the first part and theconnector member being mounted to the second part so that, when theactuator actuates the transmission, the first part and the second partare driven together or apart by the helicoidal ramp arrangementcooperating with the connector member, the helicoidal ramp arrangementcomprises a first ramp and a second ramp that are spaced apart andgenerally parallel and between which the connector member relativelymoves along the helicoidal ramp arrangement, the connector member isurged against the first ramp in the closed position and against thesecond ramp in the open position, and the connector member is urgedagainst the first ramp during closure to pull a movable cover partconnected to the first part or the second part from the open positioninto the closed position.
 12. The receptacle holding unit of claim 11,wherein the movable cover part is biased into the open position by aresilient device connected to a cover support.
 13. A receptacle holdingunit for a device for preparing a beverage from an ingredient containedin a receptacle by circulating a liquid into the receptacle andcentrifugally driving the receptacle, the receptacle holding unitcomprising: a first part and a second part cooperating with the firstpart; a cavity for receiving the receptacle, the cavity being defined byat least one of the first part and the second part; and a driving devicefor relatively moving the second part towards the first part, into aclosed position for securing the receptacle in the cavity and relativelyapart from the first part into an open position for inserting thereceptacle into the cavity and/or for removing the receptacle therefrom,the driving device comprising an actuator and a transmission that has ahelicoidal ramp arrangement cooperating with a connector member forconverting a translational movement into a rotational movement or viceversa, the helicoidal ramp arrangement being mounted to the first partand the connector member being mounted to the second part so that, whenthe actuator actuates the transmission, the first part and the secondpart are driven together or apart by the helicoidal ramp arrangementcooperating with the connector member, the helicoidal ramp arrangementcomprises a first ramp and a second ramp that are spaced apart andgenerally parallel and between which the connector member relativelymoves along the helicoidal ramp arrangement, and the helicoidal ramparrangement has a first portion with a smaller slope and a secondportion with a greater slope for adjusting a transmission speed andforce between the helicoidal ramp arrangement and the connector memberto adjust a resulting speed and force of the first part and the secondpart moving between the open position and the closed position.
 14. Areceptacle holding unit for a device for preparing a beverage from aningredient contained in a receptacle by circulating a liquid into thereceptacle and centrifugally driving the receptacle, the receptacleholding unit comprising: a first part and a second part cooperating withthe first part; a cavity for receiving the receptacle, the cavity beingdefined by at least one of the first part and the second part; and adriving device for relatively moving the second part towards the firstpart, into a closed position for securing the receptacle in the cavityand relatively apart from the first part into an open position forinserting the receptacle into the cavity and/or for removing thereceptacle therefrom, the driving device comprising an actuator and atransmission that has a helicoidal ramp arrangement cooperating with aconnector member for converting a translational movement into arotational movement or vice versa, the helicoidal ramp arrangement beingmounted to the first part and the connector member being mounted to thesecond part so that, when the actuator actuates the transmission, thefirst part and the second part are driven together or apart by thehelicoidal ramp arrangement cooperating with the connector member, thehelicoidal ramp arrangement comprises a first ramp and a second rampthat are spaced apart and generally parallel and between which theconnector member relatively moves along the helicoidal ramp arrangement,the connector member is urged against the first ramp in the closedposition and against the second ramp in the open position, the connectormember rests on the second ramp when the first part and the second partare moved between the open position and the closed position, and thefirst portion forms an end portion of the helicoidal ramp arrangementwhich contacts the connector member in the open position or the closedposition, the helicoidal ramp arrangement comprising a third portionhaving a slope that is less than the greater slope of the secondportion.
 15. A receptacle holding unit for a device for preparing abeverage from an ingredient contained in a receptacle by circulating aliquid into the receptacle and centrifugally driving the receptacle, thereceptacle holding unit comprising: a first part and a second partcooperating with the first part; a cavity for receiving the receptacle,the cavity being defined by at least one of the first part and thesecond part; and a driving device for relatively moving the second parttowards the first part, into a closed position for securing thereceptacle in the cavity and relatively apart from the first part intoan open position for inserting the receptacle into the cavity and/or forremoving the receptacle therefrom, the driving device comprising anactuator and a transmission that has a helicoidal ramp arrangementcooperating with a connector member for converting a translationalmovement into a rotational movement or vice versa, the helicoidal ramparrangement being mounted to the first part and the connector memberbeing mounted to the second part so that, when the actuator actuates thetransmission, the first part and the second part are driven together orapart by the helicoidal ramp arrangement cooperating with the connectormember, the helicoidal ramp arrangement comprises a first ramp and asecond ramp that are spaced apart and generally parallel and betweenwhich the connector member relatively moves along the helicoidal ramparrangement, and the driving device has a controller for controlling theactuator, the controller being configured to detect when the connectormember reaches an end position on the helicoidal ramp arrangement andstop the actuator.
 16. A receptacle holding unit for a device forpreparing a beverage from an ingredient contained in a receptacle bycirculating a liquid into the receptacle and centrifugally driving thereceptacle, the receptacle holding unit comprising: a first part and asecond part cooperating with the first part; a cavity for receiving thereceptacle, the cavity being defined by at least one of the first partand the second part; and a driving device for relatively moving thesecond part towards the first part, into a closed position for securingthe receptacle in the cavity and relatively apart from the first partinto an open position for inserting the receptacle into the cavityand/or for removing the receptacle therefrom, the driving devicecomprising an actuator and a transmission that has a helicoidal ramparrangement cooperating with a connector member for converting atranslational movement into a rotational movement or vice versa, thehelicoidal ramp arrangement being mounted to the first part and theconnector member being mounted to the second part so that, when theactuator actuates the transmission, the first part and the second partare driven together or apart by the helicoidal ramp arrangementcooperating with the connector member, the helicoidal ramp arrangementcomprises a first ramp and a second ramp that are spaced apart andgenerally parallel and between which the connector member relativelymoves along the helicoidal ramp arrangement, and the first part and thesecond part are secured in the open position or the closed position bymaintaining the actuator of the driving device activated.
 17. A beveragepreparation device comprising a receptacle holding unit for preparing abeverage from an ingredient contained in a receptacle by circulating aliquid into the receptacle and centrifugally driving the receptacle, thereceptacle holding unit comprising: a first part and a second partcooperating with the first part; a cavity for receiving the receptacle,the cavity being defined by at least one of the first part and thesecond part; and a driving device for relatively moving the second parttowards the first part, into a closed position for securing thereceptacle in the cavity and relatively apart from the first part intoan open position for inserting the receptacle into the cavity and/or forremoving the receptacle therefrom, the driving device comprising anactuator and a transmission that has a helicoidal ramp arrangementcooperating with a connector member for converting a translationalmovement into a rotational movement or vice versa, the helicoidal ramparrangement being mounted to the first part and the connector memberbeing mounted to the second part so that, when the actuator actuates thetransmission, the first part and the second part are driven together orapart by the helicoidal ramp arrangement cooperating with the connectormember, the driving device comprising a plurality of pairs of thehelicoidal ramp arrangement cooperating and the connector member, and/orthe first part and the second part being secured in the open position orthe closed position by maintaining the actuator of the driving deviceactivated, the helicoidal ramp arrangement comprises a first ramp and asecond ramp that are spaced apart and generally parallel and betweenwhich the connector member relatively moves along the helicoidal ramparrangement.
 18. A combination of a receptacle containing a beverageingredient and a receptacle holding unit comprising a device forpreparing a beverage from the beverage ingredient contained in thereceptacle by circulating a liquid into the receptacle and centrifugallydriving the receptacle, the receptacle holding unit comprising: a firstpart and a second part cooperating with the first part; a cavity forreceiving the receptacle, the cavity being defined by at least one ofthe first part and the second part; a driving device for relativelymoving the second part towards the first part, into a closed positionfor securing the receptacle in the cavity and relatively apart from thefirst part into an open position for inserting the receptacle into thecavity and/or for removing the receptacle therefrom, the driving devicecomprising an actuator and a transmission that has a helicoidal ramparrangement cooperating with a connector member for converting atranslational movement into a rotational movement or vice versa, and thehelicoidal ramp arrangement being mounted to the first part and theconnector member being mounted to the second part so that, when theactuator actuates the transmission, the first part and the second partare driven together or apart by the helicoidal ramp arrangementcooperating with the connector member, the driving device comprising aplurality of pairs of the helicoidal ramp arrangement cooperating andthe connector member, and/or the first part and the second part beingsecured in the open position or the closed position by maintaining theactuator of the driving device activated, the helicoidal ramparrangement comprises a first ramp and a second ramp that are spacedapart and generally parallel and between which the connector memberrelatively moves along the helicoidal ramp arrangement.
 19. Acombination of a receptacle containing a beverage ingredient and abeverage preparation device comprising a receptacle holding unitcomprising a device for preparing a beverage from the ingredientcontained in the receptacle by circulating a liquid into the receptacleand centrifugally driving the receptacle, the receptacle holding unitcomprising: a first part and a second part cooperating with the firstpart; a cavity for receiving the receptacle, the cavity being defined byat least one of the first part and the second part; and a driving devicefor relatively moving the second part towards the first part, into aclosed position for securing the receptacle in the cavity and relativelyapart from the first part into an open position for inserting thereceptacle into the cavity and/or for removing the receptacle therefromthe driving device comprising an actuator and a transmission that has ahelicoidal ramp arrangement cooperating with a connector member forconverting a translational movement into a rotational movement or viceversa, and the helicoidal ramp arrangement being mounted to the firstpart and the connector member being mounted to the second part so that,when the actuator actuates the transmission, the first part and thesecond part are driven together or apart by the helicoidal ramparrangement cooperating with the connector member, the driving devicecomprising a plurality of pairs of the helicoidal ramp arrangementcooperating and the connector member, and/or the first part and thesecond part being secured in the open position or the closed position bymaintaining the actuator of the driving device activated, the helicoidalramp arrangement comprises a first ramp and a second ramp that arespaced apart and generally parallel and between which the connectormember relatively moves along the helicoidal ramp arrangement.